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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47af5e705e30787b57ac2da10be2f46f4ab186cc649475572cfd58af53b1ce6b' 
  AND token = 'OHsP0H9Ci9Fl6cDbeifk/TUd6gFLyZ0SbWYQNToZnuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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