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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e7d988c2dae51621aeae8ee6da9516af094c67f63df4713ff64516ab6a69c41' 
  AND token = 'XqNBnBlXHLNoAeB0V5j9E3BLGQkS6KtYlufV+a5inCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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