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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75fdd9e5db87c1b4e73802b535bf8ab1c7fcee9a447c44fabe956bbeacd5fd07' 
  AND token = 'J57KHvxFurUMYmlvmeaADzgMXUFMEOzPI8faVWgLHiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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