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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e4fdfcf89a1a9fa29e18c202910d049422d392b1faab2ed87abb8c9c3794732' 
  AND token = 'lZF92xgO5AGBsmTfMnwh9beyZb9B21V4mhNsiZFhXs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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