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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5877c54c0e98762c1ce39a6abb2f4c1a4c39879543357c6e2ef7b5f3f3feda72' 
  AND token = 'eFLiD4+VSv5EdRQ1SXkhMDR6eXsi9ieiVfnlvKyU51E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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