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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb5b36b937892be7aa2e3fb0c0cd002f22e34bfc0f3caafa36702be32f676c8b' 
  AND token = 'xaRmA4nPccEuInbyTRa1Q6kbC56Pydh1e8XRa8pbe28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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