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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9da1465358cd295c6ffe45c1d19e35526c4c66cc31e829faebeab13b230e523' 
  AND token = 'CTIygjkmGxClJuLa1knMi+MPQj4MC5HbXRBjPZW0Ns0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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