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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96652319fa7c515e1e35b65d9d6df0f365c0c7d4ee7cca88d6ad1f37f62c5ac9' 
  AND token = 'EpEmNKooyIcdml+LrFL1SSDiok+CwlOxBQq4pbDswYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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