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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '073601bbf34d608634408f4018b5050c6fc114f00eb4e9590bda5896ac0386f7' 
  AND token = 'FFzrvTVBGTgULHjMTaoJ4SOd+kFysVgN+klbdEJ1y0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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