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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d75495c048334558a0bc0172e21a3ff1acbbb5b0a2edea5370c3a7ee7207676' 
  AND token = 'ZrPnRVZT6odRNm93IR+sOfnxT62mA09a9lpMnVITa1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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