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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d72c7fc5b7e3fdfd4470f7e99792e1730b5d661f7852e712678ae490fa632ed' 
  AND token = '1YREbA5mpOLvSf4zDrmDSzWHM+HzsFspDc4B+KSVtRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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