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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd408349e5b81753dc58f205db5e2c39d1c9de7b5051619f8e5bef94c2452cdfb' 
  AND token = 'x9U7E7ZDAx9DiO4UGJcMT/yAEQNXPcIeIXqvnvTE4AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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