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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ae22feaaecb1e5b59f195b5a03cc058c2313b34238470384ca7e53b373c6c91' 
  AND token = 'a0eWC0uw7SuaR/bgpMkZi5Gk1Jzic8Xu5uncuFNUzH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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