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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cdf850cb1779fd4c39ffbefc58ebbeabf1b629f6a1c0dd93392a668bea2eab1' 
  AND token = 'BIoJHZOrWZP2eljj7+7s3TYuDzJxmribPf8W7SSed3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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