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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '881c3ac5e500d6eb2e89759200acdd7b5b75bafaa0b9d0cd999a3cbf3be651df' 
  AND token = 'ulhJBPlBn3U0xqpXZ8XoyK2aXDiaCAjf05UJdgaxJQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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