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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e6317f1d4a51e1ca5f4bd3aa8f385c31d3ce61f9bb4981788d1f0a37b7eaae6' 
  AND token = 'AVoFE3zyAjjNjy6DJPcW0R/5z3JKKdmpBroDzb6Jc3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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