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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bdec82432ced1b8ef1ac5e4c3f59b94fa894b88cf7d9b891376b65f576188f7' 
  AND token = 'm7TId7+ONMbdcm1QWzOe3zEfpvcQwXLjoOcG4S4vowQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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