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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da778f254f447fc5aaaa8a1f179488cf1f7e16e05a5781a35a1bac74fef20552' 
  AND token = 'bhSaA6khUO1IAO3Si1ZtBVNZX6woAcVXEIBJ298AITs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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