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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1178f89a65b3eee81ee1c1ba981865dc231448154fb5ec6a525824f01fade2e' 
  AND token = '5OIF2OlxW6pnAtxop5slzaU6p2h3z+CjR2ktrYZMXrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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