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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4c62ccdbaf5feab2d81a1420e233a43e8e23616069c6605af3d43fe229990d3' 
  AND token = 'OHxb9EMwq727990J5287PYAZ7ULfu9/ODWguXwZJbCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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