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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04c986f674182d6d7a4cb97e0c9e56c4d8aec5e9cd3968a5e00f03c96d01d24d' 
  AND token = 'O/SjibE8Fss6fHWSrcCuxC0Nf2NcRIzbFeKZSj4vBwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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