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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c4124e570e5952ec7e50e78f6d06ad13eee85b19602aa780b67c95345bd5e78' 
  AND token = '0eH4nIpa5zCssdPWHbNDoDiPTCIg1ZsSJY2aCh/co3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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