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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b289e6b9311dc063c2b0f5669d55162d27d745d4ffa37155861cc1c9fe16022' 
  AND token = 'kbGKSf8mSMvA80FocZbGTyPEibet3DdiJMxc9ihIi/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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