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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ae9e138de7b13abc0c890365d22a3fa026d44948723bb23be6998c741b462aa' 
  AND token = 'p30kh+71l2o7Tohzl2hOKkhOey5Dqlq8emCwOAI49AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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