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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43082326109d917dd5a930e2efd75788cdc9348c48b39dfcb64764cba85641ec' 
  AND token = 'AivS0uwzdwtU74tL9wjcvi8efr5Bbxm2bpn8HKZV6tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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