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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bff74f34b7ba621a8cbb8bfbd5e9a51f38ff7511c4274e9263d3b4d621778e79' 
  AND token = 'mcvOdgotFBy9wo3vEQH0I7EG85B6RZdlF48XkrGjTiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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