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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7405a20f1da0efbea1c5fd0145fde3094420439b308e33e40f90a038366289b9' 
  AND token = 'ff0ujpFH+Rw/KFHYmUKT5rh5DSn7cOCUercrpoQWyBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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