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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b6da7e134cbee76d3004e11cf9e8436c06f22dc2699ce7922c743c7cc2e0ed4' 
  AND token = 'jrAYFuKfwWeHlsNMGeRoPdTikFNCrZnQOQC23fZ1khM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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