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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3099dfdad191a746d0a16df585676bb0c13f2e1d267ab9eb70d41bdc328d91f2' 
  AND token = 'Vv9DyRSA2C73lzJn/B4dGAlslp6vr56nsjj4O3UGWlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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