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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed9ea4a32d14b9d389595ffa649b5507f7ab76d0e2a08e9c5eb2e01a07c4d271' 
  AND token = 'xab/Z1uoiPeSkE7V6NA91kfMk8jdM/xIRi4Jezu0mdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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