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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73a94e9dd34217c160098b521ba8b300111955ce1b0301fd4ff2ab3791bfc74a' 
  AND token = 'srYaVlmS4wwToV4FSRgd7XLzfIbmRzo+qFE0tngfqXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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