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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a523f724fb668ad6f7efdfdeb447baa65c5f8abdc8fd59d550a597ed0db008ad' 
  AND token = 'bGkAppeSNrlgLfiIDHV1zGT+WHq/hfik8v61FDabYzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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