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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d4dc7aa3ed090cc8e71dcb1f014b98ae57b9b63eb9a51ff4f963d7c4e293ea6' 
  AND token = 'FE6l2fnGYQZ9MULtokUC8Ewz4apbfEOtfuDf0OUhvII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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