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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9817c61a8850f13ef3d6fc81590c9f098c0f0e877cebc8c0f9577a2a3c4df4f3' 
  AND token = 'Ue+e8gjB+F4Rci10oQNgrxxDyd5bPfMszGXK4k0DgGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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