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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cce2927723a66d003a332fe9dc181fdde0a18c52abfedadc606a8e3a07c27c8a' 
  AND token = '5JydZP4l1VUdavNiONSAbYn5/P8UQjU19jdxFdT4yMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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