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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88b301eb9d5a76e164b833c7711a4245208f1ad92e90de310061c43741006efa' 
  AND token = 'BgeHGkrn3OH/rn7/QwqJJOlBeHTtdrytyqO+Mz/cksg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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