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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8864357632100b28fff5d3c9e9df2f29f8ced6ef6d9f3e92b54a80287933ea3d' 
  AND token = 'e7ecJTVhVGci2xdKLHoE+eQiesX0IDSTeBAR4OUAJRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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