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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '759b2ba53c7070c71370c4f0396d12789b46bece5864684b07d1feea7920cc9c' 
  AND token = 'kdqSz6iPX128+R4DerpsgzQ1lzLPj8NORsie8sAgvUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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