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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb89ad7fb057db24107d73d41fa95d5a972ec0029860e609bb1d4e88391036f0' 
  AND token = 'vdOJRjuq/2b/0oPZmNaSqFGOJgAa8iJRciCJ/YAtOs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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