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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eda2a04efd5f3ef55d02a58f5ed0ac1e14710c916e9ce18e81d7d2b15c06c21a' 
  AND token = 'Bgi4qDhh3w3w9l9kTwx3mnebHKwmiukG879QUdCPSmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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