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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9bc6e49a5ccc90027699cd1de6de7992f7b1f3b22deb8124d310f89889b24220' 
  AND token = 'xDPgNjgrLy0abnCPkh6Nx72u3ChVIaLUjg+PMzK6ejk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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