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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0d0d407b7c27681029f2ff0b8ac5b6589ab69a2e90b31ec20b5444ab5ffb8e3' 
  AND token = '86tgfVMMfGBb2v0aupIu21wHE6hV+4dDTn9Grk8zN34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}