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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1985de2c0d7fc4d39b67691f232a0422828ce7a70a3e561d46eabb17b0adf799' 
  AND token = 'w/JA0l2PfArXXal5QMvAKf6mU+nN5dJYCcDEZZbbsP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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