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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15d2284b485c95b0720aad2bb9321cfc707d75baa5bd27b60bd96591502006a9' 
  AND token = '3EHrAkY7NTTjOH/h5lbjncRT8hVehY9ssk6kCgUWcjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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