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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a87a433480742e950d66e378c88f0ad1e8eb9531216c907242e293ba8c9fb43' 
  AND token = 'sp+cuwrxZu8wa1cHLogx3EVnENb7CXu67IMfedaLhpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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