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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac2573d37dd3d9a073239754ef579d742c2cabd3dc277d48aadaae01ac7de69a' 
  AND token = 'zXhp7FHPOzkgQS1FFGp+woCLx+ZToWMIFZuJ3AN+CmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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