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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32b3cfa0c8bf0051c7cac4f7d6c897387a8f3aede6b4920a61f06a1bba9ce865' 
  AND token = 'iclvLG4JjQJ1+wyYoJ1Om2lQLNZrzpkYag2FozalxIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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