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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '918984ddd6503a81a03fa090db0a6c225b20c32fbcb58b0160496b14ac988b51' 
  AND token = 'LdTMWF9OfRXb1TO1LtZxS7BqZ2lkpC1ix9Wlb57ay+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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