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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '687054c74c246756264cdded245994ff75f784811308ba4601219c012aae5905' 
  AND token = 'rF9Z+X3H9KOhsL8MrLgQ07Y7dXNBeS4UteC30fkb8hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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