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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53eef7e095df861daecac5a9d0c2fb5b4cfd54bcb00203c1b09b93a58c659ce3' 
  AND token = '0Xyt/SrYi8670wi38rnxyUIp3Q0n85TcH694ZY0DCzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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