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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5253699cdfd4fafc966c7d05f470a7fd6663ef056e0e581372f877f51360cb40' 
  AND token = 'etDGb9qJQKcpUXxmow4FcDabOD70s3uWuwvW3bGlU84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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