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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1cd5d9af06a612ae8cb0f6d4c8efe5151f6b4f66a04b13d4bfec2b38907c4ba' 
  AND token = '2VmGGj137OvCDpf1cYHk13HTw0AZhT19XZnNfNTGBx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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