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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac62adf6970caf223ea9caa106c343191f321ed103eac959b074940154136959' 
  AND token = 'ziQ+aqTiS/hjF4QzIfOGhBmrwHFqv1O6veBc+uLkRk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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