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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5243713f237a810b0979ac14fefc32a726e80be8a5e10a0737cb48793318a1b0' 
  AND token = 'wQ54b2Oe1gf3r+bf0ImkpWahJXDIXYFBLTj6OnVQiMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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