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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '292762ddbcea40a7b1ada7542fa7dd877b62e6e2db06b1b5ae43bcaaa36fd874' 
  AND token = 'VNdUjwNUeAcLfXVUNkn/fKycJujhBbpytb3CYsRFSDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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