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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a36397f44d0f4938626605fa712877d93461e5c2f0c6dd43368c5b89de3b8eb5' 
  AND token = 'S+jW73wim+l0WSnefFHQxFTaLHWK4+IqkkUG545mg0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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