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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '593b8660363cef9475eac8a016cbcb6d3fc7e1ab3b10dc0939865933208aeb6f' 
  AND token = 'po20HYVj3MD5OFiO1LGoeRwEtCqvyDoxhzlhPVIFWXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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