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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eae2b8c7076dd39f51941ab018ce912d3bbdbb6b3f17058526dabad62292c059' 
  AND token = 'm1ZScMN9vSE++9xcuVp208biZQKJwRAHJJAdKvBQYi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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