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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94f0351f4411149d4f8f29b6f78f85aed62f965c64eedd061ce60afb31a4850c' 
  AND token = '3dEstY0hX0IzKK7iYYQYizSAkoeqAVO1NG0WCQ5RTgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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