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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e24cc5d07ff2002a29975a71ed4cc4467fc73a66be96d3518113db696dd74d8' 
  AND token = 'qQCAE2NmgixMdbWMASYkCn5VFO3dVXuuIQ0LFKwflaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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