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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94ab5888ba852e2b4e7d42c618e71caae1994f61b852c5d5be7f1c239a0e4914' 
  AND token = 'qK2dGDRis/nfTlx4fSEJ9vX82HQTRcPkCPHRMqrvhEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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