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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e51d6948986a08222a94a8111847f035d1968fa1e2ecc5eb282d726a2aa61a2c' 
  AND token = 'Q1soHowED+tdE1E1F0rnbOabde88V2WjZd5k7UzEayg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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