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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb33f8e76309bfb768cbd30f2e343fa56ae31bb85fed775ea026fca97229b921' 
  AND token = 'xSpvfeTi2mnKwlP+bSa21j1UNlj3uEU49XVi7XOQ+TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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